This fully-multicoated eyepiece is one of the shortest focal length and most economically-priced Plössl eyepieces available. It’s designed for very high magnification lunar and planetary observing and for splitting close binary stars. The field of view is surprisingly wide when compared with other Plössls in this focal length range. A soft rubber eyecup on the titanium-colored body shields the eye from ambient light. Its very short eye relief will severely vignette the field of view for eyeglass wearers. We can't recommend this eyepiece for those who must wear glasses while observing. Plastic caps are supplied to keep both ends of the eyepiece dust free.

Eye relief is the distance from the last surface of the eye lens of an
eyepiece to the plane behind the eyepiece where all the light rays of
the exit pupil come to a focus and the circular image is formed,
sometimes called the “Ramsden Disk.” This is where your eye should be
positioned to see the full field of view of the eyepiece. If you must
wear glasses because of astigmatism, you’ll usually need at least 15mm
of eye relief or longer if you want to see the full field of view with
your glasses on.

A note on our eye relief figures: Quite
often, our eye relief figures will differ from those of the
manufacturer. This is because we measure the “usable” eye relief, while
the manufacturers specify their usually-longer (but technically correct)
“designed” eye relief.

The eye lens of the eyepiece is normally
recessed below the rubber eyeguard or rubber rim of the eyepiece to keep
the lens from being scratched during use. An eyepiece might have a
“designed” eye relief of 15mm (and the eye relief will truly measure
15mm from the eye lens to where the image forms). However, if the eye
lens is recessed 3mm below the eye guard, the Ramsden Disk forms only
12mm above the eyepiece body (the 15mm “designed” eye relief, less the
3mm of eye relief made unusable by having the eye lens recessed into the
body of the eyepiece). This “usable” eye relief of 12mm (measured from
the rolled-down eyeguard – the closest point you can get your eye to the
eye lens – to where the image forms) is the eye relief figure we would
measure and list in this website.

Why is it important to list the “usable” eye relief? For
those people who don’t wear eyeglasses while observing, a few mm
difference between the eye relief they expect from the manufacturer’s
literature and the shorter eye relief they actually get in real life
doesn’t mean a lot. They can simply move a little closer to the eyepiece
to see the full field, and never realize that the eye relief is a
little shorter than they expected. However, some people must wear
eyeglasses while observing, because of severe astigmatism. These
observers can’t move closer to the eyepiece if the eye relief is shorter
than expected because their glasses get in the way. For these people,
the real life “usable” eye relief is more important than the technically
correct but sometimes not fully usable “designed” eye relief. We
measure and list the actual usable eye relief so that people in the real
world can pick the eyepieces that will work best for them.

This is the length of the effective optical path of a telescopeor eyepiece (the distance from the main mirror or lens where the lightis gathered to the point where the prime focus image is formed). Focallength is typically expressed in millimeters.

The longer the focallength, the higher the magnification and the narrower the field of viewwith any given eyepiece. The shorter the focal length, the lower themagnification and the wider the field of view with the same eyepiece.

Hi guys. Today i want to tell you about this product. First of all, I have a bad telescope. But, with this eyepiece, it let me see Saturn, Jupiter, a little bit of Uranus and Venus, the moon, and Neptune. But Pluto was so little and white because my telescope is not so good but your telescope might be perfectly fine. Trust me.

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By adding 1 of these items to your cart your order total will be less than $100, and will ship within the 48 contiguous United States for $8.95. Add $70.05 to your order, however, and you qualify for free ground shipping (heavy items with fixed shipping, such as counterweights, excluded).

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Clear skies,
Astronomics

This fully-multicoated Celestron eyepiece is one of the shortest focal length and most economically-priced Plössl eyepieces available. It’s designed for very high magnification lunar and planetary observing and for splitting close binary stars. . . .